Ayush Khemka
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 Oct9 comment If $\displaystyle x^2+\frac{1}{x^2}=66$ then what is the value of $\displaystyle\frac{x^2-1+2x}{x}$? +1 for the initial heads up. I just detailed your method to explain it step by step in my answer. Jul23 comment Differentiate $\sin \sqrt{x^2+1}$with respect to $x$? Oh yes, and I think I used $x$ instead of $\sqrt {x^2+1}$. I'm so sorry for that! Jul23 comment Differentiate $\sin \sqrt{x^2+1}$with respect to $x$? The edits are accepted, they're right. But that was the way I was taught in school (back in the eleventh grade I guess), to work in functions rather than substitute variables, probably to make things easier for us back then. So, thank you everyone for your suggestions/reviews. May31 comment Given $\int _0 ^{+ \infty} \frac{1}{(1+x)^a} =1, \ \ a =?$ oh well, ok i'll do that, think it has the same meaning though May31 comment Given $\int _0 ^{+ \infty} \frac{1}{(1+x)^a} =1, \ \ a =?$ ok, i'll put it, thanks Feb19 comment Find $\int e^{-x}\cos x\,dx$ without using complex numbers edited it, thanks for the reply! Feb19 comment Find $\int e^{-x}\cos x\,dx$ without using complex numbers I think this answer here can help you prove that math.stackexchange.com/a/138269/61588 Feb19 comment Find the minimum value of $|\sin x+\cos x+\tan x+\cot x+\sec x+\csc x|$ for real numbers $x$ oh OK, I didn't pay attention to it probably. My bad. Sorry. Feb19 comment Find the minimum value of $|\sin x+\cos x+\tan x+\cot x+\sec x+\csc x|$ for real numbers $x$ I've updated the link. It seems to be working now. Have a look. I'm sorry for posting a redirecting link. Feb9 comment Where am I going wrong in this integration @Julian Kuelshammer thanks for the edit! Oct10 comment Profit and loss: deciding CP here its considered that he takes the cost of repairs into account and adds that to his original cost price. Sep22 comment How to solve an nth degree polynomial equation I would like to mention here that $a_0$,$a_1$,$\ldots$ are all constants Sep22 comment How to solve an nth degree polynomial equation @Johannes thanks for editing Sep21 comment How to calculate $\int_{0}^{+\infty} {\sin {x^2}\mathrm{d}x}$? have a look at this Wolfram Alpha Solution